Strang-Marchuk

[termi-official]

What kind of problems is it mostly used for? Please describe.

Semidiscrete EP problems.

Describe the algorithm you’d like

Classical ABA scheme.

Other implementations to know about

I think all EP codes have it.

References

• G. I. Marchuk, On the theory of the splitting-up method., in Numerical Solution of Partial
  Differential Equations-II, Academic Press, 1971, pp. 469 – 500.
• G. Strang, On the construction and comparison of difference schemes, SIAM Journal on
  Numerical Analysis, 5 (1968), pp. 506–517

[termi-official]

This will require a bit of refactoring.

1. The current integration interval is not trivilaly known to a subintegrator.
2. If one of the subintegrators is an operator split with adaptivity, then on step failure the rollback might not do the correct thing.